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REV: 081805

Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device

may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.

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GENERAL DESCRIPTION

The DS89C420 offers the highest performance

available in 8051-compatible microcontrollers. It

features a redesigned processor core that executes

every 8051 instruction (depending on the instruction

type) up to 12 times faster than the original for the

same crystal speed. Typical applications see a speed

improvement of 10 times using the same code and

crystal. The DS89C420 offers a maximum crystal

speed of 33MHz, achieving execution rates up to 33

million instructions per second (MIPS).

The DS89C430 ultra-high-speed flash microcontroller

is an improved version of the DS89C420. The device

offers

more

features,

such

as

in-application

programming, for approximately the same price.

Engineers

interested

in

the

DS89C420

are

encouraged to compare both devices when selecting

an ultra-high-speed flash microcontroller.

APPLICATIONS

ORDERING INFORMATION

PART

TEMP RANGE

MAX

CLOCK

SPEED

(MHz)

PIN-

PACKAGE

DS89C420-MNG

-40°C to +85°C

25

40 PDIP

DS89C420-QNG

-40°C to +85°C

25

44 PLCC

DS89C420-ENG

-40°C to +85°C

25

44 TQFP

DS89C420-MCL

0°C to +70°C

33

40 PDIP

DS89C420-QCL

0°C to +70°C

33

44 PLCC

DS89C420-ECL

0°C to +70°C

33

44 TQFP

DS89C420-MNL

-40°C to +85°C

33

40 PDIP

DS89C420-QNL

-40°C to +85°C

33

44 PLCC

DS89C420-ENL

-40°C to +85°C

33

44 TQFP

FEATURES

8051 Pin- and Instruction-Set Compatible

Four Bidirectional I/O Ports

Three 16-Bit Timer Counters

256 Bytes Scratchpad RAM

16kB Flash Memory

In-System Programmable through Serial Port

1kB SRAM for MOVX

Selects Internal Program Memory Size from

0 to 16k

Allows Access to Entire External Memory Map

Dynamically Adjustable by Software

§

High-Speed Architecture

1 Clock-Per-Machine Cycle

DC to 33MHz Operation

Single-Cycle Instruction in 30ns

Optional Variable Length MOVX to Access

Fast/Slow Peripherals

Dual Data Pointers with Auto

Increment/Decrement and Toggle Select

Supports Four Paged Modes

§ Power Management Mode

Programmable Clock Divider

Automatic Hardware and Software Exit

§

Two Full-Duplex Serial Ports

§

Programmable Watchdog Timer

§

13 Interrupt Sources (Six External)

§

Five Levels of Interrupt Priority

§

Power-Fail Reset

§

Early Warning Power-Fail Interrupt

The Ultra-High-Speed Flash Microcontroller User’s Guide

should be used in conjunction with this data sheet.

Download it at www.maxim-ic.com/microcontrollers.

Pin Configurations appear at end of data sheet.

Data Logging

Vending

Security and Door Access

Control

Automotive Test

Equipment

Building Energy Control and

Management

Motor Control

Gaming Equipment

Uninterruptible Power

Supplies

Magstripe

Reader/Scanner

Programmable Logic

Controllers

Consumer Electronics

Telephones

Industrial Control and

Automation

Appliances (Washers,

Microwaves, etc.)

www.maxim-ic.com

DS89C420

Ultra-High-Speed Microcontroller